THE NOL FRAGMENT VELOCITY RANGE
Abstract
An improved method is described for photographically determining fragment velocities from exploding cases. A multislit object-image velocity matching system was used to increase the clarity of the records obtained with the geometry of the Bragg-Messerly rotating-drum camera shadowgraph method (OSRD report 3900, July 1944). A rotating-drum camera records the passage of fragments past 3 slits lighted by G.E. FT-422 flash tubes. The film movement is parallel to the trajectory of the fragments. The fragment velocity can be calculated with a 1 to 2% accuracy from a knowledge of the fragment patch, defined by the geometry of the range, the speed of film, and spacing of successive fragment images. The maximum number of usable velocity determinations is 15 to 20 from each shot. The useful vertical beam was limited by the flash-tube length. Further developments are suggested.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 02, 1953
- Accession Number
- AD0008284
Entities
People
- A. D. Solem
- B. N. Singleton Jr.
Organizations
- Naval Ordnance Laboratory